Moved to VirusScan for better handling.
There was a bug with one version that caused severe delays in scheduling. I'm wondering if you shouldn't try to get the most up to date version possible by doing the following:
Uninstall all McAfee in the normal manner. How to Uninstall, Change, or Repair a Program in Windows 7 and Windows 8
Run the MCPR Cleanup Tool and reboot.
Go to your online account and download a fresh copy from there.
The latest version doesn't have this bug and it also is more Windows 8 friendly for those with touch screens etc.